WO2013129687A1 - Encre, cartouche d'encre et procédé d'enregistrement par jet d'encre - Google Patents

Encre, cartouche d'encre et procédé d'enregistrement par jet d'encre Download PDF

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Publication number
WO2013129687A1
WO2013129687A1 PCT/JP2013/056048 JP2013056048W WO2013129687A1 WO 2013129687 A1 WO2013129687 A1 WO 2013129687A1 JP 2013056048 W JP2013056048 W JP 2013056048W WO 2013129687 A1 WO2013129687 A1 WO 2013129687A1
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Prior art keywords
ink
pigment
water
particle
mass
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PCT/JP2013/056048
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English (en)
Inventor
Masashi Yamamoto
Eiichi Nakata
Shuichi Okazaki
Satoshi Takebayashi
Original Assignee
Canon Kabushiki Kaisha
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Publication date
Application filed by Canon Kabushiki Kaisha filed Critical Canon Kabushiki Kaisha
Priority to US14/232,650 priority Critical patent/US9187662B2/en
Publication of WO2013129687A1 publication Critical patent/WO2013129687A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/30—Inkjet printing inks
    • C09D11/32—Inkjet printing inks characterised by colouring agents
    • C09D11/322—Pigment inks

Definitions

  • he present invention relates to an ink suitable for use in ink jet, and an ink cartridge and an ink jet recording method using the ink.
  • an ink comprising water, a water-soluble organic solvent and an organic pigment, wherein a primary particle of the organic pigment has a ratio (minor axis b) / (major axis a) of 0.70 or more and a particle diameter of 35 nm or less, the ink contains a water-soluble organic solvent with a dielectric constant of 25.0 or less in an amount of 0.5% by mass or more based on the total mass of the ink, and a dielectric constant s mix of the ink as calculated according to the following equation (1) is 66 or more and 72 or less:
  • n means a kind of water or the water-soluble organic solvent
  • ⁇ ⁇ is a dielectric constant of water or the water-soluble organic solvent represented by n
  • r n is a content of water or the water-soluble organic solvent represented by n based on the total mass of the ink.
  • an ink capable of recording an image whose ozone resistance and color developability on various kinds of recording media are improved at a high level at the same time, and an ink cartridge and an ink jet recording method using such an ink.
  • the present inventors have then verified the mechanism of the deterioration of a recorded image caused by being exposed to ozone.
  • a conventional ink containing an organic pigment is applied to a recording medium, a pigment layer in a state of containing voids is formed. Since an oxidizing gas such as ozone enters the interior of the pigment layer from the surface thereof through the voids, even a pigment particle located in the interior of the pigment layer comes to be exposed to ozone. It is thus considered that the ozone resistance of an image recorded is lowered.
  • the present inventors have considered that if a pigment layer in a state of being tightly filled with a pigment particle may be formed, only a pigment particle located at the surface thereof is oxidized by ozone, and a pigment particle located in the interior thereof is not oxidized, and so higher ozone resistance than before can be achieved.
  • an organic pigment constituted by a near- spherical primary particle small in particle diameter is used as a coloring material of an ink, a pigment layer in a state of being tightly filled with the pigment particle can be formed, and consequently high ozone resistance is achieved.
  • a value of a ratio (minor axis b) / (major axis a) of the primary particle is utilized as an index to indicate that the pigment particle is close to a sphere.
  • particle having a particle diameter of 35 nm or less and a ratio (minor axis b) / (major axis a) of 0.70 or more can record an image improved in ozone resistance.
  • the organic pigment which is used in the ink according to the present invention and constituted by a near-spherical primary particle small in particle diameter is hard to form a structure. Accordingly, a pigment particle in a state of being dispersed in the ink is normally composed of one primary particle.
  • a pigment particle dispersed in such a state that plural primary particles have gathered is also present.
  • such pigment particle is formed by at most several primary particles. This is greatly different from carbon black liable to form a structure by gathering of a great number of primary particles.
  • an organic pigment in a state of being dispersed in the ink is constituted by plural primary particles (that is, secondary particle) , but also when it is constituted by one primary particle, it is described as "pigment particle" for the sake of convenience.
  • the particle diameter of the primary particle is small, such a pigment particle tends to easily aggregate in the ink because the surface area of the pigment particle per unit mass becomes large.
  • the pigment particle aggregates in the ink the
  • the present inventors have found that when the dielectric constant s mix of an aqueous medium (a mixture of water and a water-soluble organic solvent) in the ink is controlled to 66 or more, the pigment particle is hard to aggregate in the ink and can be stably dispersed.
  • the definition of the dielectric constant 8 mix will be described in detail subsequently.
  • the art paper is one of recording media having a coating layer like glossy paper.
  • the pore size of the coating layer thereof is large compared with glossy paper, so that the pigment particle is easy to penetrate into the coating layer.
  • the art paper tends to lower the color developability compared with the glossy paper. The occurrence of this phenomenon is considered to be attributable to the fact that the pigment particle of which the particle diameter of the primary particle is small is easy to penetrate into the coating layer of the art paper compared with a conventional pigment particle.
  • the present inventors have carried out an investigation under such an inference that the penetration of the pigment particle may be reduced by aggregating the pigment particle to some extent on the surface of a recording medium upon application of ink to the recording medium.
  • the dielectric constant s mix of the aqueous medium the mixture of water and the water- soluble organic solvent
  • the total content of a water-soluble organic solvent with a dielectric constant of 25.0 or less is controlled to 0.5% by mass or more
  • water which is a substance high in dielectric constant is evaporated in the ' course of the penetration of the ink into the recording medium, whereby the dielectric constant as the ink is rapidly lowered to promote the aggregation of the pigment particle.
  • the aggregation is caused to proceed before the pigment particle is fixed to the recording medium, so that the pigment particle remains on the surface of the recording medium and in the neighborhood thereof to improve the color developability of the image even in the art paper.
  • the dielectric constant 8 mix is more than 72, or the content of the water-soluble organic solvent whose dielectric constant is 25.0 or less is less than 0.5% by mass, the promotion of aggregation of the pigment particle after the ink is applied to the recording medium becomes insufficient, so that the pigment particle penetrates into the coating layer of the art paper to lower the color developability of the image.
  • the water-soluble organic solvent whose dielectric constant is 25.0 or less is contained in excess, the dielectric constant s mix is liable to be less than 66, and so the pigment particle is easy to aggregate in the ink as described above. As a result, there is a tendency for improvement in the ozone resistance of the image to become difficult.
  • the dielectric constant s m i X calculated according to the equation (1) is 66 or more and 72 or less;
  • a water-soluble organic solvent with a dielectric constant of 25.0 or less is contained in an amount of 0.5% by mass or more.
  • the ink according to the present invention contains an organic pigment (hereinafter also referred, as "pigment particle” merely) constituted by a primary particle having a ratio (minor axis b) / (major axis a) of 0.70 or more and a particle diameter of 35 nm or less.
  • the content (% by mass) of the pigment in the ink is favorably 0.1% by mass or more and 10.0% by mass or less, more favorably 0.1% by mass or more and 5.0% by mass or less based on the total mass of the ink.
  • the ink may also contain two or more organic pigments constituted by the primary particle, the ratio (minor axis b) / (major axis a) of which is 0.70 or more and the particle diameter of which is 35 nm or less.
  • a pigment different from the above organic pigment and/or a dye may also be used in combination as a coloring material of the ink.
  • another coloring material is used in addition to the organic pigment constituted by the primary particle having a ratio
  • the proportion of the organic pigment of all the coloring materials in the ink is favorably 30.0% by mass or more.
  • the organic pigment examples include a phthalocyanine pigment, a quinacridone
  • pigment an azo pigment, an isoindolinone pigment, a benzimidazolone pigment, a diketopyrrolopyrrole pigment, a dioxazine pigment, an anthraquinone pigment, a
  • the phthalocyanine pigment, quinacridone pigment and azo pigment are favorable, and the phthalocyanine pigment is particularly favorable.
  • a resin-dispersed pigment using a resin as a dispersant and a self-dispersible pigment into the particle surface of which a hydrophilic group has been introduced may be used.
  • a resin-bonded type self-dispersible pigment to the particle surface of which an organic group containing a polymer has been chemically bonded and a microcapsule pigment in which at least a part of the particle surface has been coated with a resin may also be used.
  • a self- dispersible pigment in which a hydrophilic group has been bonded to the particle surface thereof directly or through another atomic group is favorable. The reason for it is that since the hydrophilic group has a
  • the hydrophilic group include nonionic groups and ionic groups. Ionic groups are favorable, and anionic groups are more favorable.
  • nonionic groups such as -OH
  • anionic groups such as -COOM, -S0 3 M, -PO 3 HM and -P0 3 M 2 .
  • formulae is a hydrogen atom, alkali metal, ammonium or organic ammonium.
  • said another atomic group (-R-) linear or branched alkylene groups having 1 to 12 carbon atoms, arylene groups such as a
  • phenylene and naphthylene groups an amide group, a sulfonyl group, an amino group, a carbonyl group, an ester group and an ether group may be mentioned.
  • the salt in the ink may be in any state of a partially dissociated state and a wholly dissociated state .
  • examples of such a self-dispersible pigment those obtained by conducting an oxidation treatment with sodium hypochlorite, an underwater ozone treatment and an ozone treatment, and then conducting wet oxidation with an oxidizing agent to modify the surface of a pigment particle may be mentioned.
  • a pigment dispersion liquid or an ink is suitably diluted with pure water, and a pigment particle in the dispersion liquid or the ink is then photographed through a transmission electron microscope (TEM) or a scanning electron microscope (SEM) to regard the longest diameter extending through the center of gravity of a minimum-unit particle constituting the pigment particle as a particle diameter of a primary particle thereof.
  • An average value of particle diameters of 30 primary particles is regarded as a particle diameter of the primary particle thereof.
  • the primary particle is required to have a particle diameter of 35 nm or less, and the particle diameter is favorably 25 nm or less.
  • the lower limit of the particle diameter of the primary particle is 5 nm or more.
  • the particle diameter of the primary particle is defined as the longest diameter in the present invention.
  • the prescription of the primary particle diameter of a pigment an average value of the longest diameter and the shortest diameter has
  • the primary particle of the organic pigment used in the present invention may be said to be generally smaller than a conventional small-sized organic pigment defined by the average value of the longest diameter and the shortest diameter if both organic pigments have the same primary particle diameter.
  • the primary particle is near spherical.
  • a sphericity measuring method commonly used in such a field as toners is difficult to be applied to such a pigment small in particle diameter as used in the present invention.
  • a ratio (minor axis b) / (major axis a) of a primary particle is used as an index indicating that the primary particle is substantially spherical.
  • the major axis a and the minor axis b of the primary particle are first measured in the same manner as in the above-described measurement of the particle diameter of the primary particle.
  • a pigment dispersion liquid or an ink is suitably diluted with pure water, and a pigment
  • TEM transmission electron microscope
  • SEM scanning electron microscope
  • a ratio (minor axis b) / (major axis a) is calculated from, the major axis a and the minor axis b measured in this manner.
  • An average value of ratios of minor axis b/major axis a of 30 primary particles is regarded as a ratio (minor axis b) / (major axis a) of the primary particle thereof.
  • the ratio (minor axis b) / (major axis a) of the primary particle is required to be 0.70 or more and is favorably 0.80 or more.
  • the ratio (minor axis b) / (major axis a) is theoretically 1.0 or less.
  • the particle diameter and ratio (minor axis b) / (major axis a) of the primary particle in the present invention as measured in the above-described manner are values measured on the pigment particle itself exclusive of a resin and the like. When the pigment particle in a state of being dispersed in the ink is of one primary particle, such particle becomes a primary particle.
  • ink according to the present invention may be dispersed in a state of being plural primary particles have gathered in the ink (a secondary particle has been formed) .
  • the organic pigment is often
  • the average particle diameter of the pigment particle present in the ink is
  • a 50% cumulative particle diameter D 5 o (nm) in a particle diameter distribution of the pigment particle is favorably 70 nm or less for the pigment particle present in the ink.
  • the lower limit of D 50 is favorably 30 nm or more.
  • D 50 can be measured by means of, for example, a particle diameter distribution measuring apparatus of a dynamic light scattering system.
  • the preparation process of the pigment particle is roughly divided into two processes of a breakdown process and a build-up process.
  • the breakdown process is a process in which a mixture of a bulk material or a raw material compound, a
  • the build-up process is a process in which a pigment particle is obtained through such a process as a chemical reaction and deposition from a raw material compound dissolved in a solvent.
  • shearing-type stirring machine for preventing clogging in a nozzle or a path of the dispersing device.
  • the disc provided on the stirring shaft may be either a perforated disc or a disc with a notch or groove formed therein.
  • Sonifier 250D manufactured by BRANSON, as designated by trade names, may be used.
  • the high-pressure collision type dispersing machine for example, a dispersing machine provided with a chamber in which the mixture is pressurized by a high- pressure plunger pump to eject it from a small-diameter nozzle may be used.
  • a media-less dispersing machine provided with a chamber in which the mixture is pressurized by a high- pressure plunger pump to eject it from a small-diameter nozzle.
  • the rotation shearing-type stirring machine used in the pretreatment may be a stirring machine capable of applying shearing force to the raw material in the mixture, and a conventionally known batch type stirring machine may be used.
  • shearing force used herein includes mechanical energy capable of dispersing powder or fine particle, such as impact force or cavitation, in addition to shear stress. It is
  • the shear rate is favorably set to lOVsec or more, more favorably lOVsec or more.
  • Such high shearing force may be applied by using a stirring machine provided with a rotor and a stator, in which a gap between the rotor and the stator is set small, and high-speed rotation becomes feasible.
  • a stirring machine batch type stirring machines such as "ULRRA-TURRAX” (manufactured by IKA) , "T.K. HOMO MIXER” and “T.K. FILMICS (both, manufactured by Primix) , and "CLEARMIX” (manufactured by M Technique) , as designated by trade names, may be mentioned.
  • microreactor a micro-channel type liquid treating device used in, for example, a microchemical process
  • MICROMIXER and “MICROREACTOR” (both, manufactured by IMM)
  • the pigment particle constituted by the primary particle having a ratio (minor axis b) / (major axis a) of 0.70 or more and a particle diameter of 35 nm or less is prepared, it is considered that some change is favorably caused in crystal structure of a pigment which becomes a raw material.
  • the crystal structure of the pigment can be changed by the
  • pigment particle pigment dispersion liquid or ink
  • change with time such as thickening
  • particle is deposited as a fine particle from a liquid with a raw material (crude pigment) dissolved therein by means of, for example, the above-described
  • the post-treatment is favorably conducted in the presence of a resin dispersant as needed.
  • a device generally used upon the preparation of an ink jet ink for example, the above-described media-type dispersing machine, ultrasonic dispersing machine, high-pressure collision type dispersing machine or rotation shearing- type stirring machine may be used.
  • the post- treatment is favorably conducted in such a manner that no change in the shape of the pigment particle is caused by the dispersion treatment. Therefore, conditions upon the dispersion, such as dispersion time, peripheral speed, and kind and particle diameter of the media used as needed, are made gentle compared with dispersion conditions when the pigment particle used in the present invention is obtained by the breakdown process.
  • the mixture containing the raw material (crude pigment) and the dispersant used as needed is treated by the
  • the pigment particle used in the ink according to the present invention is favorably that obtained by feeding a liquid with a raw material (crude pigment) dissolved therein to a flow path formed by arranging 2 treating surfaces that relatively rotate facing each other at an interval of 1 mm or less, and depositing a pigment particle as a fine particle in the flow path.
  • a microreactor capable of embodying such a process may be mentioned "ULREA SS-11" (trade name, manufactured by M Technique) .
  • the device such as "ULREA SS-11" is a microreactor of a so-called forced thin film type, and a velocity
  • a pigment particle with a very high sphericity compared with another process can be produced.
  • the pigment particle is fixed in a tighter state to a recording medium. It is considered that the ozone resistance of an image recorded can be thereby improved.
  • Aqueous medium [0041] Aqueous medium:
  • the ink according to the present invention contains an aqueous medium constituted by water and a water-soluble organic solvent.
  • the ink is required to have a
  • n means the kind of water or the water-soluble organic solvent
  • ⁇ ⁇ is a dielectric constant of water or the water-soluble organic solvent represented by n
  • r n is a content of water or the water-soluble organic solvent represented by n based on the total mass of the ink.
  • the dielectric constant 8 m i x defined by the equation (1) indicates a dielectric constant as a whole of "the aqueous medium constituted by water and the water- soluble organic solvent" in the ink and may be
  • the dielectric constant is a value obtained by multiplying a dielectric constant (dimensionless number) peculiar to water or the water-soluble organic solvent by a content of such component in the ink (content based on the total mass of the ink, unit: % by mass), summing up the thus-obtained product for the respective components, and dividing the sum total thereof by the total content of water and the water- soluble organic solvent.
  • the dielectric constant can be measured by a general dielectric constant meter.
  • the content of water in the ink can be known by, for example, the Karl Fischer titration, and the kind and content of the water- soluble organic solvent can be known by, for example, gas chromatography (GC/ S) or high-performance liquid chromatography (LC/MS) .
  • GC/ S gas chromatography
  • LC/MS high-performance liquid chromatography
  • water-soluble organic solvent means a liquid. In the present invention, however, a solvent that is solid at 25°C (ordinary temperature) is also included in the water-soluble organic solvent.
  • a water-soluble organic solvent that is commonly used in an aqueous ink and solid at 25°C
  • 1,6- hexanediol, trimethylolpropane, ethyleneurea, urea and polyethylene glycol having a number average molecular weight of 1,000 may be mentioned.
  • the dielectric constant of the water-soluble organic solvent that is solid at 25°C is defined as a value determined
  • dielectric constant measured value
  • dielectric constant of water e a and ⁇ date
  • dielectric constant of a 50% aqueous solution of the water-soluble organic solvent A is 8 m i X , s a is
  • the reason why the dielectric constant of the water-soluble organic solvent that is solid at 25°C is determined from the dielectric constant of the 50% aqueous solution is as follows. Those capable of becoming a component of an aqueous ink in water-soluble organic solvents that are solid at 25°C include
  • the (total) content (% by mass) of the water-soluble organic solvent in the ink is favorably 3.0% by mass or more and 50.0% by mass or less, more favorably 8.0% by mass or more and 30.0% by mass or less based on the total mass of the ink.
  • this content of the water-soluble organic solvent is a value including a water-soluble organic solvent whose dielectric constant is 25.0 or less and which will be described subsequently, and a including 1, 2-alkanediol if used.
  • the dielectric constant of water is 78.5, and deionized water (ion-exchanged water) is favorably used in the ink.
  • the content (% by mass) of water in the ink is favorably 50.0% by mass or more and 95.0% by mass or less, more favorably 70.0% by mass or more and 90.0% by mass or less based on the total mass of the ink.
  • water-soluble organic solvent examples include those shown below (a numeral value in a parenthesis is a dielectric constant) .
  • Monohydric alcohols having 1 to 4 carbon atoms such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol (18.3), n-butyl alcohol, sec-butyl alcohol and tert-butyl alcohol; dihydric alcohols such as 1,2- propanediol (28.8), 1 , 3-butanediol , 1 , 5-pentanediol (27.0), 1, 2-hexanediol (14.8), 1, 6-hexanediol (7.1), 2- methyl-1 , 3-propanediol and 3-methyl-l , 5-pentanediol (23.9); polyhydric alcohols such as 1 , 2 , 6-hexanetriol (28.5), glycerol (42.3), trimethylol-propane (33.7) and trimethylolethan
  • glycol ethers such as diethylene glycol monomethyl, diethylene glycol monoethyl ether,
  • the ink according to the present invention contains a water-soluble organic solvent whose dielectric constant is 25.0 or less.
  • the content (% by mass) of the water- soluble organic solvent whose dielectric constant is 25.0 or less is required to be 0.5% by mass or more based on the total mass of the ink. That is, when the water-soluble organic solvent whose dielectric constant is 25.0 or less is only one, the content thereof is required to be 0.5% by mass or more. When two or more such organic solvents are contained, the total content thereof is required to be 0.5% by mass or more.
  • the content (% by mass) of the water-soluble organic solvent whose dielectric constant is 25.0 or less in the ink is favorably 2.0% by mass or more and 15.0% by mass or less, more favorably 2.0% by mass or more and 10.0% by mass or less based on the total mass of the ink.
  • water-soluble organic solvent whose dielectric constant is 25.0 or less include (with the dielectric constant thereof shown in a parenthesis) 3-methyl-l , 5-pentanediol (23.9), triethylene glycol (22.7), propylene glycol (16.9), 1 , 2-hexanediol (14.8), triethylene glycol monobutyl ether (9.8), 1, 6-hexanediol (7.1) and polyethylene glycol (4.6) having a number average molecular weight of 1,000.
  • These water-soluble organic solvents whose dielectric constants are 25.0 or less may be used either singly or in any combination thereof.
  • the kind(s) and content (s) of the water-soluble organic solvent (s) can be determined so as to satisfy the following conditions in view of various image
  • a water- soluble organic solvent whose dielectric constant is more than 25.0 may also be contained in the ink in addition to the water-soluble organic solvent whose dielectric constant is 25.0 or less.
  • two or more water-soluble organic solvents whose dielectric constants are 25.0 or less may be contained in the ink, and two or more, favorably three or more water-soluble organic solvents whose dielectric constants is more than 25.0 may be contained.
  • plural kinds of water-soluble organic solvents are favorably contained in the ink.
  • three or more water-soluble organic solvents are more favorably contained in the ink.
  • the water-soluble organic solvent whose dielectric constant is 25.0 or less and the water-soluble organic solvent whose dielectric constant is more than 25.0 are favorably used in combination, and two or more of the respective water-soluble organic solvents whose dielectric
  • constants are 25.0 or less and more than 25.0 are more favorably used.
  • a 1 , 2-alkanediol is favorably included in the water-soluble organic solvent whose dielectric constant is 25.0 or less.
  • the 1,2- alkanediol is used, whereby color developability of an image recorded on art paper can be greatly improved.
  • the reason why the color developability of the image recorded on the art paper can be greatly improved by using the 1 , 2-alkanediol is presumed to be as follows.
  • the 1 , 2-alkanediol is a compound having a structure similar to a so-called surfactant in which a main chain of a molecular structure thereof is constituted by a hydrophobic alkyl chain and one terminal thereof has two hydrophilic hydroxy groups.
  • the 1 , 2-alkanediol has a low molecular weight compared with a general
  • the 1,2- alkanediol can enter a small interstice between adjoining pigment particles, and the hydrophobic portion thereof is adsorbed on the surface of the pigment particle. It is thereby considered that the penetration rate of the 1 , 2-alkanediol into a recording medium is thereby slow compared with any other water- soluble organic solvent, and so a higher aggregation promoting effect can be exhibited. Such an effect is particularly effectively exhibited in the organic pigment used in the present invention compared with a general pigment.
  • the organic pigment used in the present invention is such that the particle diameter of a primary particle thereof is small, its surface area (specific surface area) per unit mass is considerably large compared with another general pigment, and so the 1 , 2-alkanediol is easier to be adsorbed on the surface of the pigment particle .
  • a 1, 2-alkanediol whose dielectric constant is 25.0 or less include 1 , 2-hexanediol
  • the number of carbon atoms of an alkyl group in the 1 , 2-alkanediol is favorably 5 to 8, more favorably 6 to 8. If the number of carbon atoms of the alkyl group is less than 5, the dielectric constant of such a 1 , 2-alkanediol becomes high, so that the aggregation promoting effect thereof may not be sufficiently achieved in some cases. If the number of carbon atoms of the alkyl group is more than 8 on the other hand, such a 1 , 2-alkanediol is hard to be dissolved in water.
  • some co-solvent has to be used in some cases for dissolving the 1,2- alkanediol in the ink.
  • the content (% by mass) of the 1 , 2-alkanediol whose dielectric constant is 25.0 or less in the ink is favorably 0.2% by mass or more and 10.0% by mass or less based on the total mass of the ink. If the content of the 1 , 2-alkanediol is less than 0.2% by mass, the effect to prevent the penetration of the pigment particle into the coating layer of the art paper may not be sufficiently achieved in some cases.
  • the content thereof in the ink is favorably 0.2% by mass or more and 10.0% by mass or less as described above.
  • the content thereof has to be controlled to 0.5% by mass or more.
  • another water-soluble organic solvent whose dielectric constant is 25.0 or less is used in addition to the 1 , 2-alkanediol whose dielectric constant is 25.0 or less, it is only
  • the content of the 1 , 2-alkanediol may be 0.2% by mass or more and less than 0.5% by mass.
  • the ink according to the present invention may contain various additives as needed.
  • additives a surfactant, a pH adjustor, an antifoaming agent, a rust preventive, a preservative, a
  • a polyoxyethylene alkyl ether is favorably caused to be contained as a surfactant in the ink according to the present invention.
  • the ozone resistance and color developability of an image recorded can be thereby further improved.
  • the present inventors consider the reason why the polyoxyethylene alkyl ether is
  • the polyoxyethylene alkyl ether is a nonionic surfactant having a polyoxyethylene chain and an alkyl chain in its molecular structure, it is compatible with both hydrophilic substance and lipophilic substance. Accordingly, the polyoxyethylene alkyl ether has an effect to stably retain a dispersed state of the pigment particle in the ink. Therefore, when the polyoxyethylene alkyl ether is contained in the ink, the aggregation of the pigment particles can be effectively inhibited, and the shape of the pigment particle can be kept nearer to a sphere.
  • the polyoxyethylene alkyl ether is a compound having a somewhat high molecular weight. Therefore, the
  • polyoxyethylene alkyl ether from and into a recording medium are gentle.
  • the compatible nature to both hydrophilic substance and lipophilic substance of the polyoxyethylene alkyl ether is also synergistically affected, whereby the penetration rate of the ink itself into the recording medium can be lowered.
  • the pigment particle in a liquid ink droplet applied to the recording medium can rapidly aggregate to form a tight pigment layer with a small amount of voids. As a result, the ozone resistance of an image recorded can be more improved.
  • the polyoxyethylene alkyl ether has a structure
  • R in the general formula is a hydrocarbon group, and m is an integer.
  • R in the general formula is favorably a lauryl group (12), a cetyl group (16), a stearyl group (18), an oleyl group (18) or a behenyl group (22) (a numeral value in a parenthesis is the number of carbon atoms in the hydrocarbon group) .
  • m in the general formula that designates the number of the hydrophilic groups in the polyoxyethylene alkyl ether is favorably 10 or more and 50 or less, more favorably 10 or more and 40 or less.
  • the content (% by mass) of the polyoxyethylene alkyl ether in the ink is favorably 0.05% by mass or more and 2.0% by mass or less, more favorably 0.2% by mass or more and 1.0% by mass or less based on the total mass of the ink. If the content of the polyoxyethylene alkyl ether is less than 0.05% by mass, there is a tendency for the effect of stably retaining the dispersed state of the pigment particle to be
  • the content of the polyoxyethylene alkyl ether is more than 2.0% by mass on the other hand, the number of polyoxyethylene alkyl ether molecules adsorbed on the surface of the pigment particle increase, and so there is a tendency for the nonionic nature of the surface of the pigment particle to be strong. As a result, the bonding of the pigment particle and the anionic group contributing to the dispersion thereof to a cationic substance
  • a recording medium becomes weak, and so the pigment particle easily penetrates into the coating layer in the art paper in particular, whereby the color developability of the image may be somewhat lowered in some cases.
  • the HLB value of the polyoxyethylene alkyl ether as determined by Griffin' s method is favorably 13 or more, more favorably 15.0 or more. If the HLB value is less than 13.0, the effect to relax the fixing of a dot becomes small, and so the effect to improve the color developability may not be achieved in some cases.
  • the upper limit of the HLB value is 20.0 as described below. Therefore, the upper limit of the HLB value of the polyoxyethylene alkyl ether favorably used in the present invention is also 20.0 or less.
  • Griffin's method is determined from a formula weight of a hydrophilic group and a molecular weight of a
  • This HLB value indicates the degree of hydrophilicity or lipophilicity of the surfactant in a range of from 0.0 to 20.0.
  • the lower the HLB value the higher the lipophilicity . (hydrophobicity) of the surfactant.
  • the higher the HLB value the higher the hydrophilicity of the surfactant.
  • Equation ( 2 )
  • HLB value 20 ⁇ (Formula weight of hydrophilic group of surfactant )/ (Molecular weight of surfactant).
  • the ink cartridge according to the present invention is provided with an ink and an ink storage portion storing this ink.
  • the ink stored in the ink storage portion is the above-described ink according to the present invention.
  • the structure of the ink cartridge is such that the ink storage portion is formed by an ink storage chamber storing a liquid ink and a negative pressure generating member storage chamber storing a negative pressure generating member holding the ink in the interior thereof by a negative pressure.
  • the ink storage portion of the ink cartridge may also be so constructed that the whole amount of the ink stored is held in the negative pressure generating member without providing the ink storage chamber storing a liquid ink.
  • the ink cartridge may be constructed so as to have an ink storage portion and a recording head.
  • the ink jet recording method is a method of ejecting the above-described ink according to the present invention by a recording head of an ink jet system to record an image on a recording medium.
  • Examples of an ink ejecting system include a system in which mechanical energy is applied to an ink and a system in which thermal energy is applied to an ink.
  • Processes of the ink jet recording method may be those publicly known except that the ink according to the present invention is used.
  • the recording medium any recording medium can be used. However, paper having permeability, such as plain paper or a recording medium (glossy paper or art paper) having a coating layer, is favorably used. In
  • the recording medium having the coating layer, by which at least a part of a pigment particle in an ink can be caused to be present on the surface of the recording medium and in the neighborhood thereof, is favorably used.
  • a recording medium may be selected according to intended use of a recorded
  • Examples thereof include glossy paper suitable for obtaining an image having a feeling of glossiness of a photographic image quality and art paper making good use of the feeling of a base material (like drawing paper, canvas matrix or Japanese paper) for expressing a picture, a photograph and/or a graphic image according to
  • Pigment Blue 15:3, "Hostparm Pink” (trade name; product of Clariant) was used as C.I. Pigment Red 122, and
  • CRO OPHTAL YELLOW 8GT (trade name; product of Ciba Specialty Chemicals) was used as C.I. Pigment Yellow 128.
  • Liquid A 1,500 mL of pure water was prepared. In addition, 90 mL of a solution with 3.0 parts of C.I.
  • Liquid B concentrated sulfuric acid (98%) was provided as Liquid B.
  • the temperatures of Liquid A and Liquid B were set to 5°C and 25°C, respectively, and the flow rates of Liquid A and Liquid B were set to 400 mL/min and 3 mL/min, respectively, to treat both liquids by means of a microreactor according to the build-up process.
  • Liquid A 1,500 mL of pure water was prepared. In addition, 90 mL of a solution with 3.0 parts of C.I. Pigment Blue 15:3 dissolved in 97.0 parts of
  • Liquid B concentrated sulfuric acid (98%) was provided as Liquid B. Further, 300 mL of a 6 mol/L aqueous solution of sodium hydroxide was provided as Liquid C.
  • Liquid C concentrated sulfuric acid
  • Liquid A, Liquid B and Liquid C were set to 5°C, 25°C and 25°C, respectively, and the flow rates of Liquid A, Liquid B and Liquid C were set to 400 mL/min, 3 mL/min and 10 mL/min, respectively, to treat these liquids by means of a microreactor
  • Liquid A 1,500 mL of pure water was prepared. In addition, 90 mL of a solution with 3.0 parts of C.I.
  • Pigment Blue 15:3 dissolved in 97.0 parts of fuming sulfuric acid (5.7% S0 3 ) was provided as Liquid B.
  • the temperatures of Liquid A and Liquid B were set to 5°C and 25°C, respectively, and the flow rates of Liquid A and Liquid B were set to 400 mL/min and 3 mL/min, respectively, to treat both liquids by means of a microreactor according to the build-up process. After the treatment, filtration was conducted by a Buchner funnel to obtain a paste. After the resultant paste was washed 3 times with ion-exchanged water, a proper amount of ion-exchanged water was added to prepare Wet Cake 3 whose pigment particle content was 15.0%.
  • Liquid A 1,500 mL of pure water was prepared.
  • the temperatures of Liquid A and Liquid B were set to 90°C and 25°C, respectively, and the flow rates of Liquid A and Liquid B were set to 400 mL/min and 3 mL/min, respectively, to treat both liquids by means of a microreactor according to the build-up process.
  • filtration was conducted by a Buchner funnel to obtain a paste.
  • a proper amount of ion-exchanged water was added to prepare Wet Cake 4 whose pigment particle content was 15.0%.
  • Liquid A 1,500 mL of pure water was prepared.
  • the temperatures of Liquid A and Liquid B were set to 5°C and 25°C, respectively, and the flow rates of Liquid A and Liquid B were set to 80 mL/min and 0.6 mL/min, respectively, to treat both liquids by means of a microreactor according to the build-up process.
  • filtration was conducted by a Buchner funnel to obtain a paste.
  • a proper amount of ion-exchanged water was added to prepare Wet Cake 5 whose pigment particle content was 15.0%.
  • Liquid A 1,500 mL of pure water was prepared.
  • the temperatures of Liquid A and Liquid B were set to 5°C and 25°C, respectively, and the flow rates of Liquid A and Liquid B were set to 400 mL/min and 3 mL/min, respectively, to treat both liquids by means of a microreactor according to the build-up process.
  • filtration was conducted by a Buchner funnel to obtain a paste.
  • a proper amount of ion-exchanged water was added to prepare Wet Cake 6 whose pigment particle content was 15.0%.
  • Liquid A 1,500 mL of methanol was prepared.
  • 90 mL of a solution with 2.0 parts of C.I. Pigment Red 122 dissolved in 98.0 parts of concentrated sulfuric acid (98%) was provided as Liquid B.
  • the temperatures of Liquid A and Liquid B were set to -25°C and 25°C, respectively, and the flow rates of Liquid A and Liquid B were set to 400 mL/min and 5 mL/min, respectively, to treat both liquids by means of a microreactor according to the build-up process. After the treatment, filtration was conducted by a Buchner funnel to obtain a paste. After the resultant paste was washed 3 times with ion-exchanged water, a proper amount of ion-exchanged water was added to prepare Wet Cake 5 whose pigment particle content was 15.0%.
  • Liquid A 1,500 mL of methanol was prepared.
  • 90 mL of a solution with 3.0 parts of C.I. Pigment Red 122 dissolved in 97.0 parts of concentrated sulfuric acid (98%) was provided as Liquid B.
  • Liquid C hydroxide was provided as Liquid C.
  • the temperatures of Liquid A, Liquid B and Liquid C were set to -10°C, 20°C and 20°C, respectively, and the flow rates of Liquid A, Liquid B and Liquid C were set to 400 mL/min, 10 mL/min and 10 mL/min, respectively, to treat these liquids by means of a microreactor according to the build-up process. After the treatment, filtration was conducted by a Buchner funnel to obtain a paste. After the resultant paste was washed 3 times with ion- exchanged water, a proper amount of ion-exchanged water was added to prepare Wet Cake 8 whose pigment particle content was 15.0%. Hydroxy groups were bonded to the surface of the pigment particle in Wet Cake 8.
  • Liquid A 1,500 mL of a solution (1.0% acetic acid solution) with acetic acid dissolved in methanol was prepared.
  • 90 mL of a solution with 1.2 parts of C.I. Pigment Yellow 128 dissolved in a mixed liquid of 87.8 parts of dimethyl sulfoxide (special grade chemicals), 8.0 parts of 0.5 mol/L potassium hydroxide (ethanol solution) and 5.1 parts of ion- exchanged water was provided as Liquid B.
  • Liquid A and Liquid B were set to 5°C and 25°C, respectively, and the flow rates of Liquid A and Liquid B were set to 50 mL/min and 3 mL/min, respectively, to treat both liquids by means of a microreactor according to the build-up process. After the treatment, filtration was conducted by a Buchner funnel to obtain a paste. After the resultant paste was washed 3 times with ion-exchanged water, a proper amount of ion-exchanged water was added to prepare Wet Cake 9 whose pigment particle content was 15.0%.
  • Liquid A 1,500 mL of pure water was prepared. In addition, 90 mL of a solution with 3.0 parts of C.I.
  • Liquid B concentrated sulfuric acid (98%) was provided as Liquid B. Further, 300 mL of a 6 mol/L aqueous solution of sodium hydroxide was provided as Liquid C.
  • Liquid C concentrated sulfuric acid
  • Liquid A, Liquid B and Liquid C were set to 90°C, 25°C and 25°C, respectively, and the flow rates of Liquid A, Liquid B and Liquid C were set to 400 mL/min, 3 mL/min and 10 mL/min, respectively, to treat these liquids by means of a microreactor
  • Liquid A 1,500 mL of a solution (1.0% acetic acid solution) with acetic acid dissolved in methanol was prepared.
  • 90 mL of a solution with 1.2 parts of C.I. Pigment Yellow 128 dissolved in a mixed liquid of 87.8 parts of dimethyl sulfoxide (special grade chemicals), 8.0 parts of 0.5 mol/L potassium hydroxide (ethanol solution) and 5.1 parts of ion- exchanged water was provided as Liquid B.
  • 300 mL of a 6 mol/L aqueous solution of sodium hydroxide was provided as Liquid C.
  • the temperatures of Liquid A, Liquid B and Liquid C were set to 5°C, 25°C and 25°C, respectively, and the flow rates of Liquid A, Liquid B and Liquid C were set to 400 mL/min, 10 mL/min and 10 mL/min, respectively, to treat these liquids by means of a microreactor according to the build-up process. After the treatment, filtration was conducted by a
  • Liquid A 1,500 mL of pure water was prepared. In addition, 90 mL of a solution with 1.0 part of C.I.
  • Liquid B Pigment Blue 15:3 dissolved in 99.0 parts of fuming sulfuric acid (5.7% S0 3 ) was provided as Liquid B.
  • the temperatures of Liquid A and Liquid B were set to 5°C and 25°C, respectively, and the flow rates of Liquid A and Liquid B were set to 500 mL/min and 6 mL/min, respectively, to treat both liquids by means of a microreactor according to the build-up process. After the treatment, filtration was conducted by a Buchner funnel to obtain a paste. After the resultant paste was washed 3 times with ion-exchanged water, a proper amount of ion-exchanged water was added to prepare Wet Cake 12 whose pigment particle content was 15.0%.
  • Resin Dispersant 1 is that obtained by neutralizing a styrene-acrylic acid copolymer (trade name "JONCRYL 680"; acid value: 215 mg KOH/g, weight average molecular weight: 4,900, product of BASF) with potassium hydroxide so as to give a neutralization equivalent of 0.85.
  • a dispersion treatment was conducted for 60 minutes at 3,500 rpm by means of a high-speed rotation type dispersing machine (trade name "CLM-2.2S", manufactured by M Technique), centrifugal separation was conducted for 30 minutes at 5,000 rpm to remove an aggregation component.
  • the thus-treated mixture was diluted with ion-exchanged water to obtain Pigment Dispersion Liquid 1 whose pigment content and water-soluble resin (solid) content were 10.0% and 6.0%, respectively .
  • Dispersion Liquid 2 whose pigment content was 10.0%.
  • Pigment Dispersion Liquid 3 whose pigment content was 10.0% was obtained in the same manner as in the case of "Pigment Dispersion Liquid 2" except that Wet Cake 3 adjusted to pH 8 with an aqueous solution of potassium hydroxide was used in place of Wet Cake 2.
  • Pigment Dispersion Liquid 4 whose pigment content was 10.0% was obtained in the same manner as in the case of "Pigment Dispersion Liquid 2 " except that Wet Cake 4 adjusted to pH 8 with an aqueous solution of potassium hydroxide was used in place of Wet Cake 2.
  • Pigment Dispersion Liquid 5 whose pigment content was 10.0% was obtained in the same manner as in the case of "Pigment Dispersion Liquid 2 " except that Wet Cake 5 adjusted to pH 8 with an aqueous solution of potassium hydroxide was used in place of Wet Cake 2.
  • Pigment Dispersion Liquid 6 whose pigment content was 10.0% was obtained in the same manner as in the case of "Pigment Dispersion Liquid 2 " except that Wet Cake 6 adjusted to pH 8 with an aqueous solution of potassium hydroxide was used in place of Wet Cake 2.
  • Pigment Dispersion Liquid 7 whose pigment content and water-soluble resin (solid) content were 10.0% and 6.0%, respectively, was obtained in the same manner as in the case of "Pigment Dispersion Liquid 1" except that Wet Cake 7 was used in place of Wet Cake 1.
  • Pigment Dispersion Liquid 8 whose pigment content was 10.0% was obtained in the same manner as in the case of "Pigment Dispersion Liquid 2" except that Wet Cake 8 was used in place of Wet Cake 2.
  • Pigment Dispersion Liquid 9 whose pigment content and water-soluble resin (solid) content were 10.0% and. 6.0%, respectively, was obtained in the same manner as in the case of "Pigment Dispersion Liquid 1" except that Wet Cake 9 was used in place of Wet Cake 1.
  • Resin Dispersant 1 and 40.0 parts of water were mixed. After the resultant mixture was dispersed for 3 hours by means of a batch type vertical sand mill. After a dispersion treatment was conducted for 60. minutes at 3,500 rpm by means of a high-speed rotation type dispersing machine (trade name "CL -2.2S", manufactured by M Technique) , centrifugal separation was conducted for 30 minutes at 5,000 rpm to remove an aggregation component. The thus-treated mixture was then filtered under pressure through a cellulose acetate filter
  • Pigment Dispersion Liquid 10 whose pigment content and water-soluble resin (solid) content were 10.0% and 10.0%, respectively.
  • a commercially available pigment dispersion liquid (CAB-O-JET250C, product of Cabot) containing a self- dispersible pigment whose pigment species was C.I.
  • Pigment Blue 15:4 was diluted with ion-exchanged water to obtain Pigment Dispersion Liquid 11 whose pigment content was 10.0%. Sulfonic groups were bonded to the surface of the pigment particle in Pigment Dispersion Liquid 11 through phenylene groups.
  • Pigment Dispersion Liquid 12 whose pigment content was 10.0% was obtained in the same manner as in the case of "Pigment Dispersion Liquid 2" except that Wet Cake 10 was used in place of Wet Cake 2.
  • Pigment Dispersion Liquid 13 whose pigment content and water-soluble resin (solid) content were 10.0% and 10.0%, respectively, was obtained in the same manner as in the case of "Pigment Dispersion Liquid 10" except that C.I. Pigment Red 122 was used in place of C.I. Pigment Blue 15:3.
  • a commercially available pigment dispersion liquid (CAB-O-JET265M, product of Cabot) containing a self- dispersible pigment whose pigment species was C.I. Pigment Red 122 was diluted with ion-exchanged water to obtain Pigment Dispersion Liquid 14 whose pigment content was 10.0%. Sulfonic groups were bonded to the surface of the pigment particle in Pigment Dispersion Liquid 14 through phenylene groups.
  • Pigment Dispersion Liquid 15 whose pigment content and water-soluble resin (solid) content were 10.0% and 10.0%, respectively, was obtained in the same manner as in the case of "Pigment Dispersion Liquid 10" except that C.I. Pigment Yellow 128 was used in place of C.I. Pigment Blue 15:3.
  • C.I. Pigment Red 122 Ten parts of C.I. Pigment Red 122 was dispersed in 100 parts of an aqueous dispersion liquid (resin (solid) content: 20.0%) containing a fine acrylic resin
  • Pigment Dispersion Liquid 16 whose pigment content and water- soluble resin (solid) content were 10.0% and 20.0%, respectively.
  • Pigment Dispersion Liquid 17 whose pigment content was 10.0% was obtained in the same manner as in the case of "Pigment Dispersion Liquid 2 " except that Wet Cake 11 was used in place of Wet Cake 2.
  • Pigment Dispersion Liquid 18 whose pigment content was 10.0% was obtained in the same manner as in the case of "Pigment Dispersion Liquid 2" except that Wet Cake 12 was used in place of Wet Cake 2.
  • Pigment Dispersion Liquid 19 A commercially available pigment dispersion liquid
  • Pigment Blue 15:4 was diluted with ion-exchanged water to obtain Pigment Dispersion Liquid 19 whose pigment content was 10.0%.
  • Functional groups containing a phenylene group and two phosphonic groups were bonded to the surface of the pigment particle in Pigment
  • Pigment Yellow 155 was diluted with ion-exchanged water to obtain Pigment Dispersion Liquid 20 whose pigment content was 10.0%. Carboxy groups were bonded to the surface of the pigment particle in Pigment Dispersion Liquid 20.
  • Tables 1-1 to 1-4 were mixed and sufficiently stirred, the resultant respective mixtures were filtered under pressure through a membrane filter (trade name "HDCII FILTER", product of Pall) having a pore size of 1.2 ⁇ to prepare respective inks. Details of the trade names in Tables 1-1 to 1-4 are shown below.
  • DISPERSE AID W-28 Dispersant, product of SAN NOPCO, "Disper BYK184”: Resin dispersant, product of BYK Japan, "NIKKOL BC-202: Polyoxyethylene cetyl ether, product of Nikko Chemicals, HLB value: 15.7, the number of moles of an ethylene oxide group added: 20,
  • Characteristics of the inks are shown in lower parts of Tables 1-1 to 1-4.
  • An image of a pigment particle was photographed through a transmission electron microscope (TEM) or a scanning electron microscope (SEM) to regard the longest diameter extending through the center of gravity of a primary particle thereof as a particle diameter of the primary particle.
  • the particle diameter of the primary particle was
  • a 50% cumulative particle diameter (D 50 ) in a particle diameter distribution of a pigment particle in each ink was measured by means of a
  • NANOTRAC UPA150EX manufactured by NIKKISO
  • NIKKISO dynamic light scattering system
  • Table 1-1 Composition and characteristics of ink
  • An ink cartridge charged with each of the inks obtained above was installed in an ink jet recording apparatus (trade name "PIXUS Pro9500 Mark II", manufactured by Canon Inc.) provided with a recording head for ejecting an ink by the action of thermal energy.
  • an image recorded under such a condition that resolution is 600 dpi x 600 dpi, and eight ink droplets each of which is 3.5 ng are applied to a unit region of 1/600 inch x 1/600 inch is defined as "recording duty being 100%”.
  • a pattern containing two solid images of 50% and 100% duties was recorded on each of glossy paper and art paper.
  • evaluation criteria according to the colors of the respective inks. From such a reason, evaluation criteria for color developability and ozone resistance were set according to the colors of the inks .
  • the evaluation criteria of the respective evaluation items are shown in Table 2.
  • “C” was regarded as an unacceptable level
  • "B” was regarded as an acceptable level
  • "A” was regarded as an excellent level
  • “AA” was regarded as a particularly excellent level. Evaluation results are shown in Tables 3-1 and 3-2.
  • the recorded article obtained by using the glossy paper was put in an ozone fadeometer (Suga Test Instruments) and exposed to ozone for 300 hours under conditions of an ozone concentration of 5 ppm. With respect to the solid image whose recording duty was 50% in the

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  • Engineering & Computer Science (AREA)
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  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
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Abstract

Cette invention concerne une encre contenant de l'eau, un solvant organique hydrosoluble et un pigment organique, une particule primaire dudit pigment organique ayant un rapport (petit axe b)/(grand axe a) de 0,70 ou plus et un diamètre de particule de 35 nm ou moins. L'encre selon l'invention contient un solvant organique hydrosoluble ayant une constante diélectrique de 25,0 ou moins en une quantité de 0,5 % en poids ou plus sur la base du poids total de l'encre, et une constante diélectrique εmix de l'encre, calculée selon l'équation (1) suivante, est de 66 à 72. Equation (1): εmix = ∑n εnrn/∑nrn où n désigne un type d'eau ou le solvant organique hydrosoluble, εn est la constante diélectrique de l'eau ou du solvant organique hydrosoluble représenté par n, et rn est la teneur en eau ou en solvant organique hydrosoluble représenté par n sur la base du poids total de l'encre.
PCT/JP2013/056048 2012-03-02 2013-02-27 Encre, cartouche d'encre et procédé d'enregistrement par jet d'encre WO2013129687A1 (fr)

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JP2016145336A (ja) 2015-01-29 2016-08-12 キヤノン株式会社 インクセット及びインクジェット記録方法
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JP6702818B2 (ja) 2015-08-07 2020-06-03 キヤノン株式会社 水性インク、インクカートリッジ、及びインクジェット記録方法
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